fix(docs): checkout release version in getting_started.md (#276)

Author: hu55a1n1

docs/getting_started.md

@@ -112,6 +112,7 @@ Now clone and build the repo:
 ```bash
 git clone ssh://[email protected]/informalsystems/cycles-quartz
 cd cycles-quartz
+git checkout v0.1.0             # or latest release, check `git tag --sort=-v:refname`
 cargo install --path crates/cli
 ```